Depending on how long he was out of the water for, he might have some kind of internal damage.
I've found once the eyes start clouding over and drying out, it generally means it will be a difficult recovery period if the fish doesn't succumb first.
Clean water (I use IAL and aquarium salt for serious cases), dim lighting and providing high-protein foods, is about all you can do for fish that have jumped. You don't want to add any medications as this could stress an already compromised system.
Hopefully he recovers. It's terrible finding them half-dead on the floor.